3 days before, i fell off a hoverboard sideways on the right side on the support of my arm. I felt a jerk which was really painful in my whole arm, from my hand to my shoulder(right), i went to the doctor and i dont have any fractures but tissue injury. I think i kept my arm too stiff yesterday, i cant move it. Whole flexion and extension of my arm is really difficult, i have my exam 3 days later. I can move my hand though and write but i need help with the arm movement, i cant move it.